Using split rail supply for single rail DC - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 15th March 2008, 05:06 PM   #1
DanX is offline DanX  United Kingdom
diyAudio Member
Join Date: Mar 2008
Default Using split rail supply for single rail DC

I want to add a preamplifier to my LM1876T IC amp using the DC supply available, it seems to work OK when connected to the DC+ and centre tap at the bypass capacitors but there is a loud hum on the audio output, perhaps an earth loop. When connected to the DC+ and DC- rails it blows the AC fuses. I have used the same preamp (LM1036N) in a battery powered portable amp with TB820M with excellent results (single rail setup) the DC goes into a standard 7812 regulator on the preamp board with a 220uf bypass cap before it. Any help would be much appreciated, I'm not einstein I just like to build my own electronic goods rather than buying them.
Thanks all,
  Reply With Quote
Old 15th March 2008, 05:18 PM   #2
TheMG is offline TheMG  Canada
diyAudio Member
Join Date: Jan 2008
Your preamp requires a single-ended supply. It must be connected to the + rail and ground (center tap) of the power supply.

Hooking it up to +/- shorts the - rail to circuit ground.

The hum is likely a ground loop.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
LM3886 Single Supply Rail Transformer Setup john65b Chip Amps 16 29th October 2013 01:58 PM
split rail supply obtain from a single motorcycle battery? leinahtan Power Supplies 5 30th August 2006 05:56 AM
Single supply opamp - unequal rail voltage and opamp selection Hans L Parts 8 19th February 2006 02:15 PM
basic split rail PSU mcai7et2 Solid State 6 30th January 2003 11:10 AM

New To Site? Need Help?

All times are GMT. The time now is 08:40 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2